Centaurea nigrescens
From Bugwoodwiki
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Overview
- Appearance
- A perennial herb with erect, branched, glabrous or somewhat long-hairy stems that grows 1.3-3.2 ft. (0.4-1.0 m) tall.
- Foliage
- Stems are erect or ascending, openly branched distally, villous to scabrous with septate hairs and loosely tomentose. Leaves are basal and proximal cauline, petiolate, blades oblanceolate or elliptic, 2-10 in. (5–25 cm) long, margins entire or shallowly dentate to irregularly pinnately lobed; distal cauline sessile, not decurrent, blades linear to lanceolate, gradually smaller, entire or dentate.
- Flowers
- Flowers are radiant or discoid, in few-headed corymbiform arrays, borne on leafy-bracted peduncles. The involucres are 0.6-0.7 in. (15–18 mm), subcylindric to ovoid or campanulate, usually longer than wide, even when pressed. Flowering summer–fall (Jun–Oct).
- Fruit
- Fruit are gray to light brown, 0.09-0.11 in. (2.5–3 mm) long, and finely hairy. The seeds are small, 0.02-0.04 in. (0.5-1 mm) long, and darkly colored.
- Ecological Threat
- Centaurea nigrescens can be found in disturbed areas including along roadsides, fields, pastures, and waste areas. It is native to Europe.
Resources
Washington State Noxious Weed Control Board [1]
USDA NRCS PLANTS [2]
USDA ARS GRIN [3]
www.eFloras.org [4]
Images from Bugwood.org
